Mode Idea: Reverse
The basic idea behind this game mode would be to reverse the scaling off of everything. So abilities that scale off of AP now scale AD, and vice versa. If an ability scales off of both, the percentages would be switched. Armor scaling abilities would now scale off of MR, and Health scaling would instead scale with Mana. So for example, Ryze's abilities would now scale with his max hp and AD instead of AP and Mana.